Truncated forms of the second-rank orthorhombic Hamiltonians used in magnetism and electron magnetic resonance (EMR) studies are invalid-Why it went unnoticed for so long?
Keywords: 75.10.Dg; 71.70.Ch; 75.30.Gw; 75.10.âb; 75.10.Jm; 75.; 05.70.Fh; Zero-field splitting (ZFS) Hamiltonian; Truncated orthorhombic Hamiltonian; Maximum rhombicity; Crystal-field (CF) Hamiltonian; Electron magnetic resonance (EMR); Magnetism; Magnetic aniso